Thule Chasm Sport Duffel Bag - Waterproof Travel Duffel for Gym, Camping & Outdoor Adventures - Durable Carry-On Luggage for Sports Equipment & Gear

This is a great duffel bag. It's plenty roomy. I had a 60 liter REI duffel bag that I took on a long trek; it proved to be just a little too small for my needs over two weeks and it could not be carried as a backpack. The 70 liter Thule can be carried as a backpack (great for moving around the airport) and the straps can be converted to a shoulder sling (I use this the most). It also has traditional two grip handles that can be strapped down out of the way. The bottom is rugged and though I haven't used it much, it is much more durable that the material on the REI bag. Lastly, my two weeks of gear (including a sleeping bag cinched down in a compression bag) fit in this bag with room to spare. I wish the small zippered pocket was lockable but the big zipper that opens the lid can be locked (if you bring the lock). I want to stress that the material should last many years as it is thick.